Knee lifter-pad for sewing-machines



J. GOLDBERG.

KNEE LIFTER PAD FOR SEWING MACHBNES'. APPLICATION FILED APR. 22} 1920avwawto'c W W Patented Feb.1,1921,

UNITED STATES PATENT OFFICE.

JACOB GOLDBERG, OF CINCINNATI, OHIO, ASSIGNOR TO THE GOLDBERG PADDINGMACHINE COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

KNEE LIFTER-PAD FOR SEWING-MACHINES.

Application filed April 22,

T 0 all whom it may concern Be it known that I, JACOB GOLDBERG, acitizen of the United States of America, and a resident of Cincinnati,in the county of Hamilton and State of Ohio, have invented a new anduseful Improvement in Knee LiftenPads for Sewing-Machines, of which thefollowing is a specification.

'An object of my invention is to provide a pneumatic knee lifter pad foruse with a knee lifter plate employed for operating the presser-foot ofa sewing machine for instance such as is shown in the patent to GoldbergNo. 1,187,724.

Another object of my invention is to provide a soft contact for anoperators knee when operating a sewing machine, thereby avoidingformation of calli on the knee.

These and other objects are attained by the means described herein anddisclosed in the accompanying drawing, in which Figure 1, is a sideelevation of a pad embodying my invention, attached to a presserfootoperating lever.

Fig. 2, is a transverse sectional view, on an enlarged scale of a kneelifter pad embodying my invention and mounted on a knee lifter plate.

Fig. 3, is an enlarged end view of a pad embodying my invention, part ofthe pad being broken away.

My invention comprises an air-filled chamber between layers of rubberand forming a pneumatic pad that may be attached to a lifting plate.

The pad A, comprises an upper layer or pad section a, and a lower layeror pad section a, of rubber, the outer edges of the sections beingunited to form a chamber a between them. This chamber a is sealed,

Specification of Letters Patent.

Patented Feb. 1, 1921.

1920. Serial No. 375,726.

confining the air therein. At several places adj acent to the upperlayer a, are formed a series of upwardly and inwardly extending lugs aadapted to engage a knee lifting plate B, and to secure the pad uponsuch lifter plate.

The rod O is attached to the presser-foot of a sewing machine. Whenupward pressure is exerted upon the pad A and the plate B, the foot ofthe machine is pulled up making it possible to feed material to theneedle of the machine. Considerable upward pressure is required to pullthe foot upward, and calli formed upon that portion of the operatorslimb engaging the knee plate B.

Having thus described my invention, what I claim is:

1. As a new article of manufacture a pneumatic pad comprising a casing,an air chamber within the casing and means to attach the pad to a lifterplate of a sewing machine.

2. As a new article of manufacture a pneumatic pad comprising an upperand a lower pad section, an air chamber between the pad sections andlugs extending from one of the pad sections, and adapted to engage alifter plate.

3. As a new article of manufacture a pneumatic pad, the combination of acasing having upper and lower sections united at their outer edges, anair chamber between the casing sections and lugs extending upwardly andinwardly from the outer edge of the pad.

In witness whereof, I have hereunto subscribed by name this 20th day ofApril, 1920.

JACOB GOLDBERG.

